"When environments change, they usually do so pretty rapidly, at rates with which adaptation by natural selection would be hard put to keep up. When such change occurs, the quality of your adaptation to your old habitat is irrelevant, and any competitive advantage you might have had may be eliminated at a stroke."

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The strain of constant adaptation to so many fearful events and discoveries is already too much to bear with sanity; one has to keep pretending to slip successfully into the new mould; a time will come when the tailored and camouflaged mind breaks beneath the burden; the stick insect in our brains no longer cares to resemble a twig on the same habitual human tree in the mere hope that it may survive extinction.

— Janet Frame